After install M Lion, the preview lost sound

I just install M Lion, after that I use preview to whatch some avi file. it work but no sound. please help

RewAU
Re: hdmi sound problem began after 10.7.2 update 
Nov 22, 2011 7:29 AM (in response to mwahlman)
I've now recieved a reply from one of the Senior Technical Advisors at AppleCare who was kind enough to follow up with engineering.
Apparently this change was intentional in 10.7.2 to bring the behaviour of the headphone jack in line with the experience of users who have external displays connected via Thunderbolt !
See this support note; http://support.apple.com/kb/TS4113
I've replied to this advice by pointing out that this change actually removes functionality that was present in 10.7.0 / 10.7.1 and requested that the issue is esculated back to engineering for further comment..
I'll post again when I recieve the next reply.

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